lv2variants.py

from collections import defaultdict

import lilv

if __name__ == '__main__':
    w = lilv.World()
    w.load_all()

    lv2_AudioPort = w.new_uri(lilv.LILV_URI_AUDIO_PORT)
    lv2_InputPort = w.new_uri(lilv.LILV_URI_INPUT_PORT)
    lv2_OutputPort = w.new_uri(lilv.LILV_URI_OUTPUT_PORT)

    plugins = defaultdict(list)

    for plugin in w.get_all_plugins():
        uri = str(plugin.get_uri())

        ports = []

        inputs = plugin.get_num_ports_of_class(lv2_AudioPort, lv2_InputPort)
        outputs = plugin.get_num_ports_of_class(lv2_AudioPort, lv2_OutputPort)

        for i in range(plugin.get_num_ports()):
            port = plugin.get_port_by_index(i)
            if port.is_a(lv2_AudioPort):
                continue
            ports.append(str(port.get_symbol()))

        plugins[frozenset(ports)].append((uri, inputs, outputs))

    if len(plugins) > 0:
        for portset in plugins.keys():
            if len(plugins[portset]) < 2:
                continue
            print("---", portset)
            for uri, inputs, outputs in plugins[portset]:
                print(" ", inputs, outputs, uri)
            print()
    else:
        print("There are no variant plugins on this system.")